.warning {
    animation: warning 1.5s linear infinite
}

@keyframes warning{
    50% {
        color: rgb(255, 0, 0);
        text-shadow: 0px 0px 5px rgba(255, 0, 0, 1)
    }

    0%, 25%, 100% {
        color: rgb(255, 255, 255);
        text-shadow: 0px 0px 5px rgba(0, 0, 0, 0)
    }

}